This book explores questions about the nature of an interlanguage grammar, i.e. the grammar of a bilingual. John Archibald approaches these questions within a cognitive science perspective that draws upon abstract representational structures in demonstrating that phonological knowledge underlies the surface phonetic properties of L2 speech. Specifically, he proposes that interlanguage grammars are not 'impaired', 'fundamentally different', or 'shallow'...